Frascati Wine

I have this wine that belonged to my grandfather and I wanted to know the price. Thank you.

A 15-years worth of white wine braised chicken with, if it has not turned sour.
Reds can stand-up to long cellaring, but whites are usually spent their first 5 years.
As a collector's item? Doubtful. Maybe in 50 years as a trinket.

Open it and take a sip if it still tastes good toast your grandfather and drink.